#include <stdio.h>

int main(){
    int *ptr = NULL;
    char *cptr = NULL;
    int *arr = NULL;
    int a = 10;
    int b[5] = {1,2,3,4,5};
    int c = 'a';
    ptr = &a;
    arr =b;

    printf("int size: %d\n",sizeof(a)); // 4
    printf("int ptr size: %d\n",sizeof(ptr));  // 8
    printf("char ptr size: %d\n",sizeof(cptr));  // 8
    printf("int array ptr size: %d\n",sizeof(arr)); // 8
    printf("int array  size: %d\n",sizeof(b)); // 20

    return 0;
}